l = input()
n = input()
w = input().split()
a = int(0)

w.sort(key=int, reverse=False)

if int(l) < w.index(0):
    print("0")

for i in w:
    a = a + int(i)
    if a == int(l):
        print(w.index(i)+1)
        exit()
    elif a > int(l):
        print(w.index(i))
        exit()